回上一层第12部 第五课 --- 请重复跟读，直到可以於声音档的留空之间唸完整句為止；熟练之后您必将可以 "脱口而出" 地说出标準的美式英语
- until now
- I've been fooled until now.
- up to
- Up to yesterday, I still didn't believe he was married.
- Harold is not up to his work.
- up to (someone)
- It is up to you to improve your life.
- up to (something)
- I don't know what you are up to, but it can't be something good.
